FUNCTION: Provides exceptional clamping action for your universal t-track system configurations and assemblies. FEATURES: Ergonomically designed 5 star knobs, non-marring clamping pads, and a high tension clamping capacity. DESIGN: Made from premium grade anodized aluminum with a lever shaped profile ensuring optimal leverage in addition to work piece accessibility. VERSATILITY: Hold Down Clamp Set is ideal for work holding, positioning, and fixturing for many woodworking or metalworking applications, including routers, drill presses, CNC, table saws, jigs, panels, vertical mills and more. PLEASE NOTE: Our t-bolts, both 1/4Inch-20 and 5/16Inch-18 have a head size of 17/32Inch wide x 13/16Inch long and 7/64Inch thick. They are designed to fit Universal T-track or larger and will not fit 1/4Inch or Mini T-track. Please check the size to verify that they will work for your application. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Blue Material:Aluminum Alloy Package Contents: 4 * Hold Down Clamps for T-tracks/T-slots Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.